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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import <Foundation/Foundation.h>
@class FSTWriteGroup;
NS_ASSUME_NONNULL_BEGIN
/**
* Helper class for FSTPersistence implementations to create WriteGroups and verify internal
* contracts are maintained:
* 1. Can't create a group when an uncommitted group exists (no nesting).
* 2. Can't commit a group that differs from the last created one.
*/
@interface FSTWriteGroupTracker : NSObject
/** Creates and returns an FSTWriteGroupTracker instance. */
+ (instancetype)tracker;
/**
* Verifies there's no active group already and then creates a new group and stores it for later
* validation with `endGroup`.
*/
- (FSTWriteGroup *)startGroupWithAction:(NSString *)action;
/** Ends a group previously started with `startGroupWithAction`. */
- (void)endGroup:(FSTWriteGroup *)group;
@end
NS_ASSUME_NONNULL_END
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